Popillia japonica

What is it?

The Japanese beetle (JB) is an exotic invasive beetle that is considered a serious plant pest in the United States.

How will it impact Oregon?

Japanese beetles are generalist pests that pose a potential serious threat to Oregon’s agricultural crops, gardens, public parks, and urban forests. Adult beetles can feed on hundreds of plant species, including field crops, fruit trees, vegetables, and ornamental garden plants. Japanese beetle larvae can cause widespread damage to turfgrass by feeding on grass root systems.

What does it look like?

Where is it?

The Japanese beetle was first detected in New Jersey in 1916 and is now established throughout the eastern, midwestern, and southeastern United States. In 2016 an infestation was reported in Washington County, Oregon.

Where did it come from?

The Japanese beetle is native to Japan. It was accidentally imported to the US in nursery materials.

What should you do?

Early detection and quick action is our best defense. Report a suspected JB sighting to the OSU Plant Clinic. The OSU Insect ID Clinic also provides free insect identification.

OSU Plant Clinic
Department of Botany & Plant Pathology